Assuntos
Hipersensibilidade a Drogas/genética , Farmacogenética , Enfisema Pulmonar/genética , Animais , Formação de Anticorpos , Dissulfeto de Carbono/farmacologia , Técnicas de Laboratório Clínico , Cianatos/farmacologia , Deficiências Nutricionais/diagnóstico , Hipersensibilidade a Drogas/diagnóstico , Exposição Ambiental , Feminino , Frequência do Gene , Cobaias , Haplorrinos , Hemólise/efeitos dos fármacos , Humanos , Imunoquímica , Masculino , Pessoa de Meia-Idade , Medicina do Trabalho , Linhagem , Inibidores da Tripsina/sangueAssuntos
Aloxano/farmacologia , Cianatos/toxicidade , Hipersensibilidade Tardia , Insulina/farmacologia , Pneumopatias/induzido quimicamente , Pulmão/patologia , Tolueno/toxicidade , Animais , Formação de Anticorpos/efeitos dos fármacos , Brônquios/patologia , Feminino , Injeções Intravenosas , Injeções Subcutâneas , Pulmão/imunologia , Pneumopatias/patologia , Tamanho do Órgão , Vacina contra Coqueluche , Alvéolos Pulmonares/patologia , RatosRESUMO
The inhalation toxicity of a commercial proteolytic enzyme preparation containing 12% subtilisin Carlsberg was studied in experimental animals. Guinea pigs that had been pretreated by a series of intradermal injections of the enzyme preparation in saline solution died as a result of a single 6-hour exposure to the enzyme preparation at an air concentraion of 41.2 mg/m-3, while normal guinea pigs and pretreated guinea pigs that were dosed with an antihistamine immediately prior to exposure survived. The 6-hour LC50 for pretreated guinea pigs was determined as 24.7 mg/m-3. Normal rats, normal rabbits, and pretreated rabbits survived exposures to the enzyme preparation at concentrations as high as 36.8 mg/m-3. Pathologic examinations revealed changes only in the lungs of the exposed animals. These pulmonary alterations appear to be reversible. A histamine release is suggested as the primary effect of a secondary exposure to this proteolytic enzyme preparation.
Assuntos
Peptídeo Hidrolases/toxicidade , Aerossóis , Animais , Bacillus subtilis/enzimologia , Difenidramina/uso terapêutico , Exposição Ambiental , Estudos de Avaliação como Assunto , Cobaias , Injeções Intradérmicas , Pulmão/efeitos dos fármacos , Medicina do Trabalho , Coelhos , Ratos , Subtilisinas/toxicidadeRESUMO
The mechanism of biologic response from exposure to a 12% subtilisin Carlsberg preparation is shown to be one of histamine release in the guinea pig. Three groups of guinea pigs were pretreated by intradermal injections withsaline solution of (1) the commercial proteolytic enzyme preparation containing 12% subtilisin Carlsberg, (2) an alkaline protease preparation obtain from Aspergillus oryzae that was isolated from cotton dust, or (3) a nonproteolytic mixture of proteins and lipases obtained from cotton seeds. The histamine content of the ling, liver, and ear tissues of guinea pigs that were pretreated with any one of the three preparations showed an in untreated animals. Following challenge by intratracheal injection of a saline solution containing the subtilisin preparation, the guinea pigs pretreated with the same preparation showed a markedly reduced liver histamine level. Challenge by inhalation exposure to the subtilisin preparation of guinea pigs that were pretreated with any one of the above preparations resulted in a lower histamine concentration in the lungs and livers.
Assuntos
Histamina/metabolismo , Peptídeo Hidrolases/farmacologia , Aerossóis , Animais , Aspergillus/enzimologia , Poeira , Orelha/metabolismo , Gossypium , Cobaias , Liberação de Histamina/efeitos dos fármacos , Injeções Intradérmicas , Lipase/farmacologia , Fígado/metabolismo , Pulmão/metabolismo , Masculino , Mastócitos/metabolismo , Subtilisinas/farmacologiaRESUMO
A retrospective study was made of workers in a toluene disocyanate plant using an immunologic test procedure developed at the NIOSH laboratories. Case histories of 32 workers in seven response groupings are presented. Sensitization was found to correlate with the frequency and severity of significant exposures to TDI. Immunologic changes producing tolerance to TDI exposure also resulted in negative response to the antigen challenge tests. Some individuals exposed to TDI may have protective antibodies but still experience bronchoconstriction.
Assuntos
Indústria Química , Cianatos/toxicidade , Hipersensibilidade Tardia/induzido quimicamente , Doenças Profissionais/induzido quimicamente , Hipersensibilidade Respiratória/induzido quimicamente , Tolueno 2,4-Di-Isocianato/toxicidade , Adulto , Testes de Aglutinação , Poluição do Ar/análise , Exposição Ambiental , Humanos , Hipersensibilidade Tardia/diagnóstico , Imunização Passiva , Pessoa de Meia-Idade , Pólen , Testes de Função Respiratória , Hipersensibilidade Respiratória/diagnóstico , Estudos Retrospectivos , Fatores de Tempo , Tolueno 2,4-Di-Isocianato/análise , Tolueno 2,4-Di-Isocianato/imunologiaRESUMO
Two pilot experiments are reported in which various combinations of stress, modifiers of glucose metabolism, and sulfur deficiency were investigated using urinary sulfur levels and tissue glucose and glycogen levels as indicators. Urinary sulfur levels increased under certain conditions of stress but decreased with the injection of Escherichia coli endotoxin, suggesting an anabolic reversal. Heart and blood glycogen levels fell in rats fed a sulfur-deficient diet. These results are discussed in relation to seasonal variations in protein and glucose metabolism.